It probably would give Yamatsu very little comfort to know, but Sho didn't enjoy watching his clone go to town on Yamatsu, nor did his clone enjoy doing it. It was clear in their body language, even though the clone was holding itself back from doing real major damage to the genin the attacks slowly began to add up.
Even so, as uncomfortable as this was, Shosuke knew that this was the way that this had to go. It might have seemed cruel to an outsider, and Yamatsu may not appreciate it, but this was a major part of the training of this technique. Though it was not the central point of this technique, it was nonetheless a necessary reality that sometimes one would need it to fight against enemies or to ensure that they weren't backed into a corner against a running river should a mission go wrong.
A shinobi had to learn to fight anywhere and under any circumstances, or they were just inviting themselves up for problems down the road.
Fortunately, something Yamatsu would begin to notice was that the more he did it, the more he focused on making platforms, the easier it was to make them, and the easier it was to make them one after the other after the other. It was like riding a bike, once one developed the necessary muscle memory one could do it in one's sleep and one would never forget.
As long as Yamatsu had chakra, this would never become an issue that he would have to actively think about again. His body would simply be able to do it without putting any greater amount of thought into it.
Speaking of no greater amount of thought, it seemed that Yamatsu was finally ready to fight back as he managed to commit a body flicker across the water, the water shifting in his wake like skipping stones before firing a trio of fireballs at the clone. In turn, the clone almost mimicked Yamatsu itself, getting out of the way of the flames as they shot past and exploded within the water, sending a violent spray of scalding liquid across the air of the training arena.
"Yes! Just like that!" Sho called, ever the erstwhile cheerleader and number one supporter of his own students. Perhaps in that way he was taking after Kizumi after all, the earnest and sincere desire to see those he tutored improved worn on the smile on his face, a smile that had faded into concern since the harder parts of the lesson had begun to unfold.
However, as he had said, there were two parts of the jutsu that Yamatsu would need to familiarize himself with before he could be considered to have mastered it. The first of which was the ability to fight atop the water, and the second? Well, the second was yet to come.
Once more weaving handsigns, Sho brought out a familiar jutsu as he summoned yet another geyser of water, filling the training grounds further. However, this time he kept the waterfall up, creating a rapid torrent of a current rather than a simple lilting flow. Yamatsu would be able to feel it underfoot, needing to create more platforms and at a faster pace than before, the water having slipped out from under him before he could really think about what he was doing. It all had to rely on the development and formation of instincts.
"Kick his ass, kid!" Sho yelled, as if the one who's ass he was encouraging Yamatsu to kick was not essentially himself.